6533b82cfe1ef96bd1290219
RESEARCH PRODUCT
Tau-decay determination of the strong coupling
Antonio Pichsubject
PhysicsParticle physics010308 nuclear & particles physicsPhysicsQC1-999FOS: Physical sciences01 natural sciencesHigh Energy Physics - ExperimentHigh Energy Physics - PhenomenologyHigh Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)0103 physical sciencesStrong coupling010306 general physicsdescription
We review the current status of the determination of the strong coupling from tau decay. Using the most recent release of the ALEPH data, a very comprehensive phenomenological analysis has been performed, exploring all strategies previously considered in the literature and several complementary approaches. Once their actual uncertainties are properly assessed, the results from all adopted methodologies are in excellent agreement, leading to a very robust and reliable value of the strong coupling, $\alpha_s^{(n_f=3)}(m_\tau^2) = 0.328\pm 0.013$, which implies $\alpha_s^{(n_f=5)}(M_Z^2) = 0.1197\pm 0.0015$.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-02-01 |